FORM 160.67-PW2 (1007)
13
JOHNSON CONTROLS
LD13178
FIG. 17B –
EVAPORATOR LIQUID PRESSURE
DIFFERENTIAL SWITCH
EVAPORATOR LIQUID PRESSURE DIFFERENTIAL
SWITCH -
If desired, an evaporator Liquid Pressure Dif-
ferential Switch can be applied; - Pretempco DPS300A or
Potter 1382, max. 300 psi (YORK P/N 025-30919-000) is
available at an additional cost.
RED
BLK
LD13179
FIG. 18 –
TACHOMETER
TACHOMETER -
If desired, a tachometer can be used
for remote indication of the turbine speed; Dynalco LMD-
120A (YORK P/N 025-40250-000) is available at an ad-
ditional cost as part of the optional Turbine Gaugeboard.
The tachometer receives a 4-20mA signal from the Analog
I/O board, analog output channel #4 representing a speed
of 0-5000 rpm.
NOTE:
Remove existing wire #325 from the
Analog I/O Expansion Board P7B-4
and connect to TB7-313.
CABLE 31
(#18/2 Shielded Cable)
CABLE 31
(#18/2 Shielded Cable)
LD13180
FIG. 19 –
CHILLED LIQUID FLOW TRANSMITTER
CHILLED LIQUID FLOW TRANSMITTER -
If desired,
a flow transmitter may be connected to the chiller control
panel to display the rate of chilled liquid flowing through
the evaporator. The flow transmitter (supplied by others)
may be a 2-wire or 4-wire device. If a 4-wire device is used,
a loop powered signal isolator must be supplied by others
and wired as shown.
Depending on the type of flow measuring element and
transmitter used, the 4-20mA input signal may be a non-
linear (square root) signal. This input must be enabled and
the calibrated full scale range and the signal type must
be entered at the keypad using the Service Access Level.
Refer to Configuration Screen 2 in the Operation Manual
160.67-O1.
Do NOT apply voltage on field instrument
wiring terminal block TB7. Instrument
loop power is supplied from terminals
313 or 325.
